Machine for forming filaments.



L. E. DEMPSTER.

MACHINE FOR FORMING FILAMENTS.

APPLIOATION FILED 1330.18, 1911.

Patented Apr. 23, 1912.

3 SHEETS-$111311 1.

Inventor: Leonard EDempster,

His flttorneg.

L; E. DEMPSTER. MACHINE FOR FORMING ,TILAMENTS.

APPLICATION FILED DEG. 18,-1911.

1,024,185, Patented Apr.23, 1912.

3 SHEETS-SHEET 2.

0 Q Witnesses: sq Inventor: 2g jj/z Leoard BDmpster:

; mm w .L..B. DEMPSTHR. MACHINE FOR FORMING FILAMBNTS.

APPLICATION um DEO.18,1911.

1,024,185,. I Patented Apr. 23, 1912.

3 SHEETS-SHEET 3.

m OO an a t M w J i 1"- Witnesses: Inventor:

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. UNITED. s'rA'rEs arana LEONARD E. nnmrs'rsn, or scmncrsny, NEW YORK, assrcnoa r GENERAL v nnncrmc COMBANY,-A CORPORATION or new YORK.

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p fl a toa o't tat te n at f Patented Apr-.23, 1912.

Applieatlon flled Placental-18,1911. Serial No. QM.

To all Emmy concern: v Be-it known that LILEONARD- Damps'rnn, a subject of the King ;of Great 'Britain, residing at Schenectady, county of Schenectady; .State of New York, have invented certain new and useful "Improvements in Machines for Forming Filaments, of which i the-following is a specification.

: jmvention' I relates to the. manufacture o *i'neandes'cent lamp filaments from plastic material-such ;as ;tungsten powder mixed' .withia suitable hinder or agglomerated by the colloidal process, and its object is to provide an automatic machine for forming pendedjclaims. '1

the filament loops of proper shape and dimnsions from this plastic material.

The novel features of my invention are pointed out with particularity in 'the ap- My-invention will best be understood by reference to the accompanying drawings, showlng one embodiment 'of my invention,

in 'which- Figure 1 represents aside elevation, withthe casing 'partlybroken away, of a machine constructed in accordance with my invention. Fig. 2 shows in a 'similar'mamier an elevation at right angles to that of Fig. 1. Fig. 3 shows a plan view with the top of the casing pantlybroken away. Fig. 4 is a cross-section of the squirting device and Fig. 5 is a detail view of the filament and its carrier.

In the drawings A represents an inclosing casingwithin which is mounted the vertical shaft B. This shaft is driven by a gear C- which is engaged by a worm c on shaft D which is driven through pulley d or other means. .Theshaft B is provided with a suitable bearing E on a fixed support e. On the up er end of the shaft is fixed a carrier F 'w ich is provided with a series of studs or projections 1. These studs, as the the plunger g. This device may be mount-I 1 ea above the swimmin A a a suitable box It; The plunger g is pressed slowly downward b a screwJ whlch passes through a screwt readed support j and is rotated by a grooved pulley or. other suitable means j. The' box H may be provided with glass windows as indicated.

The plastic material comes from the die in 'a continuous filament which is picked by the projections on the rotating carrier F. These projections are spaced apart by a distance corresponding approximately to the desired width of the filament loop, and the s'peed'of the carrier is such that during the interval between the passage of successive project-ions f beneath the squirting die a snflicient length of filament is squirted for a single filament loop. I find that satisfactory results may be obtainedif the carrier F ropassage of these .successive projections be:-

neath th squirting (lie, the filament as it comes from the die is looped in zig-za-g form on the projections as clearly shown in Fig. 2. The series of loops thus formed are caried around (approximately 270 in-the arrangement shown in the drawings) 'until they come opposite the burners K A pair of these burners are provided, each supplied with gas and air through pipes 7c and k, and the pair of burners are spaced apart by the width of a filament loop and act to direct blasts of heat simultaneously against the twosides of the loop as'it passes the burners and thus to sever the loop from the continuous filament. These burners emit continuous flames and in order to prevent the preceding side of a loop from being severed as it approaches the first .burnenthc arrangement shown in detail in Fig. 5 is employed. 'The burners are so arranged as to direct their flames at slightly different heights so as to strike the carrier on points as indicated by the circles 1 and 2 in Fig.5.

The carrier F in this figure is supposed to filament, that is,'between the filament and.

the burners. These plates project below the point 1 which represents'the position of the flame-of the burner which is first reached by'a loo Itwill thusbe seen that while 1 the late f on that pm shielded the 'filalment mm the flame. When how'ever, the

filament-reaches the'position shown in Fig. 5 the two blasts of heat, are directed simultaneously on the two sides of the'loop so that the loop drops from the carrier.-

- At the same time that each loop is severed, a rod L, pivoted at 1, is thrown forward into the position shown in dotted lines in Fig. 2. -This rod' is actuated by pins or studsc" on the gear 0, which serially engagea cam m (best shown in Fig. 3) on the end of a rod M, so as to move the rod to the left as viewed in Figs. 2 and '3, thereby i rockin the rod L into the dotted line position 0 Fig. '2. When in this position the rod L engages. the bight of the loop which sticks to the rod just enough so that when the upper ends of the loop are severed the loop is inverted infalling so that it drops with the bight uppermost on to the support 0, and is thus caught by this support. This support may be in the form of a conductor provided w1th terminals 0, 0 so that current may be sentthrough it to heat it sufiiciently to softenthe loops and cause their bights to conform to the shape of the support 0. In this way the natural bend of the loops as they hang from the carrier may be modified as desired. As soon as a pin "0 asses out of engagement with the cam sur ace m the rods M and L are returned to the full line positions; in Fig. 2 by the compression spring m. A

As will be seen from Fig. 5, after each loop is severed from the continuous filament a small portion of the filament is left hooked over each support f, as'it leaves the second burner. To'remove this portion, abrush N is provided between the burners and the squirting die so that each pin f is cleaned and readyto receive another loop when it again reaches the squirting die.

What I c aim as new and desire to secure by Letters Patent of the United States, is,- 1. An automatic machine for forming filament loops of plastic material, comprising means for squirting said material in a continuous filament, means for forming the continuous filament in a series of loops, and

means for severing into separate loops.

2. An automatic machine for forming filament loops of plastic material, comprising means for squirting said material in. a continuous filament, means for catching said filament as it is squirted and looping it in zig-zag form, and means for severing the zig-zag filament into separate loops.

said continuous filament 3. In a machine for forming filament loops of plastic material, means for squirting said material ina contlnuous filament,

a carrier, and projections on said carrier traveling in a path intersecting the filament as it is squirted and spaced apart bya distance approximately. equal to the desired width of the loops.

4. In a machine for forming filament loops of lastic material, .a carrier, means for stringing thereon a continuous filament of said material in a series of loops, and

means operative when each loop reaches a predetermined point for directing on'both sides of the loop simultaneously blasts of heat for severingthe loop from the continucontinuous filament, means for forming the continuous filament in a series of loops, means for severing said continuous filament into separate loops, and means for catchingthe severed loops by their bights.

7. An automatic machine for forming filament loops of plastic material, comprising means for squirting said material in a continuous filament, means for-forming the continuous filament in a series of loops, means for severing said continuous filament into separate loops,.and a member movable into engagement with the bights of successive loops as they are severed.

8. In a machine for 'forming' filament loops of plastic material, means for forming a continuous filament of said material in a series of depending loops, means for severing individual loops near their upper ends, means for inverting the several loops as they fall, and a support for catching the inverted loops by their bights.

9. In a machine for forming filament loops of plastic material, a carrier, projections'thereon, means for stringing on said projections a continuous filament of said material in a series of depending loops, and means for severing simultaneously both sides of a loop just below the supporting projections. I

10. In a machine for forming filament loops of plastic material, a carrier, projections thereon, means for stringing on said projections a continuous filament of said filament material in a series of depending loops, In witness whereof, I have hereunto set means for severing simultaneously both my hand this 15th day of December, 1911. sides. of a loop just below the supporting projections, and means for removing from LEONARD DEMPSTLR' 5 said projections the remaining portions of Witnesses:

the filament after the depending loops have BENJAMIN B. HULL,

beensevered. I'IELEN ORFORD. 

